On a solution to the problem of the poor cyclic fatigue resistance of bulk metallic glasses

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The recent development of metallic glass-matrix composites represents a particular milestone in engineering materials for structural applications owing to their remarkable combinations of strength and toughness. However, metallic glasses are highly susceptible to cyclic fatigue damage and previous attempts to solve this problem have been largely disappointing. Here we propose and demonstrate a microstructural design strategy to overcome this limitation by matching the microstructural length scales (of the second phase) to mechanical crack-length scales. Specifically, semi-solid processing is used to optimize the volume fraction, morphology, and size of second phase dendrites to confine any initial deformation (shear banding) to the ... continued below

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Launey, Maximilien E.; Hofmann, Douglas C.; Johnson, William L. & Ritchie, Robert O. January 9, 2009.

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The recent development of metallic glass-matrix composites represents a particular milestone in engineering materials for structural applications owing to their remarkable combinations of strength and toughness. However, metallic glasses are highly susceptible to cyclic fatigue damage and previous attempts to solve this problem have been largely disappointing. Here we propose and demonstrate a microstructural design strategy to overcome this limitation by matching the microstructural length scales (of the second phase) to mechanical crack-length scales. Specifically, semi-solid processing is used to optimize the volume fraction, morphology, and size of second phase dendrites to confine any initial deformation (shear banding) to the glassy regions separating dendrite arms having length scales of {approx} 2 {micro}m, i.e., to less than the critical crack size for failure. Confinement of the damage to such interdendritic regions results in enhancement of fatigue lifetimes and increases the fatigue limit by an order of magnitude making these 'designed' composites as resistant to fatigue damage as high-strength steels and aluminum alloys. These design strategies can be universally applied to any other metallic glass systems.

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  • Journal Name: Proceedings of the National Academy of Sciences

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  • Report No.: LBNL-1967E
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1073/pnas.0900740106 | External Link
  • Office of Scientific & Technical Information Report Number: 961595
  • Archival Resource Key: ark:/67531/metadc929722

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  • January 9, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 18, 2016, 3:03 p.m.

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Launey, Maximilien E.; Hofmann, Douglas C.; Johnson, William L. & Ritchie, Robert O. On a solution to the problem of the poor cyclic fatigue resistance of bulk metallic glasses, article, January 9, 2009; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc929722/: accessed December 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.